Try adjusting your TOTALS formula to the following:
=ROUND(SUM(H6,I6,T6,U6)+ROUND(((SUM(L6,X6)/60)*INFO!$C$10),4),4)
What I believe was happening is that you had a blank cell in any of H6, I6, L6, T6, U6, or X6. When you use the add (+) operator with numbers and blank cells, it will return a #VALUE! error. By replacing those areas with a SUM function instead, it logically treats "" as 0.